Also '209a' primers wouldn't be considered corrosive either would they?

According to Federal, 209A primers are non-corrosive.

Quote:

Federal® No. 209A Primers…
The No. 209A Champion™ Primer is particularly adaptable
to a variety of powders. The basic lead styphnate mixture,
a Federal exclusive, is non-mercuric, non-corrosive, and
stable over extreme ranges of temperature and humidity.
The 209A provides instant, full, and dependable ignition
with uniform ballistics...